Speedometer drive-train.



F. A. Ross.

- 'SPEEDOMETER DRIVE TRAIN.

APPLICATION FILED MAR. II, 1914. I Patented Jan. 16,1917.

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T all whom/it may their combinations shown and described as i ED STATESv rnanx A. BOSS, or nvans'ron, rumors,

ASSIGNOR TO STEWART-WARNER SPEEDOIVL. ETEB CORPORATION, OF CHICAGO,ILLINOIS, A CORPORATION OF VIRGINIA.

'srnnnomn'rnn DRIVE-TRAIN.

concern:

Be, it known that I, FRANK A. Boss, a citizen of the United States,residing at Evanston, in the" county of Cook and State of Illinois, haveinvented new and useful Improvements 1n Speedometer Drive-Trains, of

which. the following is a specification, reference being-had to theaccompanying draw: ings, forming a part thereof. J The purpose of thisinvention is to provide an-improved drive train fora speedometer on 'amotor vehicle, particularly designed so that all gearing shall beinclosed. It consists of the various elements and the claim.

indicated by r Figure 1 is a partial plan In the drawings,

. view of an automobile chassis, indicating the-position of the drivetrain embodying this invention. Fig. 2 is a sectional view of thedifierential housing showing the gear train as mounted therem.

' shaft,

1 indicates somewhat diagrammatically'a speedometer, A, mounted in thecustomary position on the dash-board, B, of an automobile, and arrangedto bedriven throu-gli a shaft, C, extending from the A, to thedifferential housin The sha t,- G, will preferably be of the familiarfleX-- ible type incased in. a flexibletubing, but maybe any convenientform of jointed shaft adapted to transmit rotation-to the speedometer,A. -Within the differential housing,"

speedometer,

D, there is shown in Fig. '2 'the customary propeller shaft pinion, E,meshi'ng' with a large bevel gear, F, the latter having a frame orcasing, F rigid with it in which are journaled the idler pinions, F?',of the diiferential gear. These inions mesh in the"cu s-' tomarymannerwit bevel gears, -Fl,,,rigid with the respective halves, Ff,of-th'e'wi'ear. 5 axle for drivmg the road wheels.

The present invention is designed to'take advantage of the differentialhousing,1iD,as an oil-tight inclosure for a gear train for actuating thespeedometer, A.- This train comprises a comparatively large-spur gear,G,-secured by screws, G to theframe or casing, F so as to rotatewith itfordriving' a spur inion, H, secured rigidly on a small which isjournal'ed ina, speciallyformed boss, D of the difierentialljhousing.The pinion, H, preferably of fiber is held on J the shaft, J againstthe' flange, J thereof,"

Specification of Letters Patent."

, by means of a cross pin, I in the face of the pinlon,

.operatively fro'inthe "whole, especially in the course in which -withPatented Jan. 1c, 1917.

Application filed March 11, 1914. Serial No. 823,888.

K, engaging a slot and the shaft, J, is journaledin a bushing, L, fixedin the boss, D by a set screw, L and fitted with a packing washer, L toprevent theesca'pe of lubricant. v

v A pair of short shafts, M and N, are journaled in a unitaryright-angle fitting, O, and connected by spiral gears, M and N one formof the angle fitting, 0, being inserted in the bore of the boss, D fromthe outside, and clamped therein by a' clamp screw, P, operating toclose the split portions of the boss at D The shaft, N, is provided nearits inner end with a cross pin, N engaging the slotted cup-shapedterminal flange, J of the shaft, J, and this completes the transmissiontrain from the vehicle axle to the jointed shaft, C. The fitting, O, isso designed that it may be packed with sufiicient heavy lubricant tolast for. several months, and as the arm of carries the shaft, M, willbeclosely coupled to the containing tube of the flexible shaft,

there will be practically no opportunity for leakage of such lubricant,while the ordi-v nary lubricant alread present in the ential housing,'Dwil keep the gears, G and H, well oiled at all times. 7

By mounting the gear, G, which drives the meter upon the frame, F ,ofthe'idler 'pinions" of-the differential gearLtrain, the

this fitting which meter is caused'to register the'actualtravel "on:."d'one byj-th'e yehicle or the average travel orspeed of thetwo wheelsand the two axleaandmt merely'the travel or speed of either one, whichmight differ materially travel or speed of the vehicle as'a.

case-of a vehicletraveling around a cincular track or inany a" greaternumb'er'of 'turn's are made in one direction than the other. Iclaim: JIna power driven vehicle, in combination Ya principal gear train throughwhich the vehicle drive wheels are actuated, a fixed housing inclosingsuch principal gear train; a second. gear train for actuating a mecha-.nism carried by the vehicle, comprising a gear mounted within saidhousing and oper! atively connected with the principal, train, thehousing having ,an opening or aperture from its cavity'to the outside;sleeve in which it is" jburnaled, adapted to extend in and close theinner end of the apera shaft and a I ture of the housing, and meansexteriorly accessible for making said sleeve fast to the housing in saidaperture; a pinion on said shaft at the inner end of the sleeve Withinthe housing, and a coupling member on the shaft at the outer end ofthesleeve adapted to serve as a stop-collar for preventing the shaft fromescaping inwardly from the sleeve; a second gear housing,- one end ofwhich is adapted to be inserted from the outside of the principalhousing into said aperture and to close the outer end thereof,- a

shaft in said second housing j ournaled in the end portion thereof whichenters the aperture in the principal housing, and a coupling WitnessesR. H. WALPOLE, W. A. RosE.

